Characterization of Toxoplasma gondii isolates in free-range chickens from Amazon, Brazil - Dubey, J. P; Gennari, Solange Maria; Labruna, Marcelo Bahia; Camargo, Luís Marcelo Aranha; Vianna, M. C. B; Marcet, P. L; Lehmann, T (Journal of Parasitology, 2006)